Our company is China's largest in low pressure welding gas cylinder manufacturer&comma; is the national standard GN5100-2011 standard responsible for drafting unit&comma;welding gas cylinder production and sales of the nationalmarket more than 45&percnt;&comma; and 90&percnt; for export welding gas cylinder design&comma; manufacturing&period; Five types of weldinggas cylinder has nine times by the national&comma;provincial an ministry as high quality products&comma; the products are ex-ported to the west Asia&comma; the middle east&comma;western Europe&comma;southeast Asia&comma;Japan&comma;Korea&comma;Germany&comma; the United stat-es and other countries and regions&comma; for the domestic welding gas cylinder's biggest export enterprise&period; In octobe2001 by the Chinese entrepreneurs assosiation awarded the "welding gas cylinder head of the national industry"honorary title&period;

SPECIFICATION&colon;1 The cylinder should be manufactured&comma;inspected and accepted according to GB5100 welded &sol;steel&sol;gas cylinder2 The longitdinal and circumferential seams must be welded automaticly by electric-arc welding &comma;the tensile strengthof joints must be not less than minimum value required&period;3 The longitdinal and circumferential welds welds must be examined by ≥20&percnt; X-ray radiagraphy&period;4 The cylinder must be subjected to heat treatment to relieve stress entirely after all welding operation have been completed&period;5 The cylinder must withstand a hydrostatic test to 45bar without leakage and deform after heat treatment&period; Dry the internal surface after testing&period;6 The cylinder must withstand a pneumatic test to 15bar with leakage after hydrostatic test&period;

7 Internal surface must be subjected to rust cleaning before assembly an external surface must be subjected to shot blasting after assembly&period;The cylinder must be coated with anti- corrosion primer and yellow finish paint&period;8 Tread seal should be winded with PTFE&period;9 Q345R can be used as material of ends and shell &period;